mid-14c., from Latin innumerabilis "countless, immeasurable," from in- "not" (see in- (1)) + numerabilis "able to be numbered," from numerare "to count, number," from numerus "a number" (see number (n.)). Related: Innumerability.
innumerable difficulties
innovative
innovator
innovatory
innuendo
Innuit
innumerable
innumerate
-ino
Ino
inobservant
inoculate